<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>带有单选按钮的表单</title>
</head>

<body>
    <form>
        <input type="radio" name="sex" value="male" checked>Male
        <br>
        <input type="radio" name="sex" value="female">Female
    </form>
</body>

</html>